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Opt Lett. 2007 Mar 1;32(5):506-8.

Measurement of absolute flow velocity vector using dual-angle, delay-encoded Doppler optical coherence tomography.

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Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7207, USA.


Single-beam laser Doppler measurements of flow velocity are only sensitive to the velocity component parallel to the optical axis. We describe a simple modification to a standard Doppler optical coherence tomography (OCT) system using a single sample beam that provides velocity information from multiple angles within the beam. By introducing a glass plate midway into the OCT beam path, the sample beam is divided into several components, each with a different group delay and each providing a separate interferogram with its own effective Doppler angle. By combining the Doppler shift measured in each of these component interferograms, the flow velocity vector is fully determined.

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